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<div class="moz-cite-prefix">In order to prevent too many swap usage
I removed swap on this machine (swapoff -a).<br>
Memory usage was still growing.<br>
After that I started an other program that takes memory (in order
to accelerate things) and I got the OOM-killer.<br>
<br>
Here is the syslog:<br>
[1246854.291996] Out of memory: Kill process 931 (glusterfs) score
742 or sacrifice child<br>
[1246854.292102] Killed process 931 (glusterfs)
total-vm:3527624kB, anon-rss:3100328kB, file-rss:0kB<br>
<br>
Last VSZ/RSS was: 3527624 / 3097096<br>
<br>
<br>
Here is the rest of the OOM-killer data:<br>
[1246854.291847] active_anon:600785 inactive_anon:377188
isolated_anon:0<br>
active_<a class="moz-txt-link-freetext" href="file:97">file:97</a> inactive_<a class="moz-txt-link-freetext" href="file:137">file:137</a> isolated_<a class="moz-txt-link-freetext" href="file:0">file:0</a><br>
unevictable:0 dirty:0 writeback:1 unstable:0<br>
free:21740 slab_reclaimable:3309 slab_unreclaimable:3728<br>
mapped:255 shmem:4267 pagetables:3286 bounce:0<br>
free_cma:0<br>
[1246854.291851] Node 0 DMA free:15876kB min:264kB low:328kB
high:396kB active_anon:0kB inactive_anon:0kB active_<a class="moz-txt-link-freetext" href="file:0kB">file:0kB</a>
inactive_<a class="moz-txt-link-freetext" href="file:0kB">file:0kB</a> unevictable:0kB isolated(anon):0kB
isolated(file):0kB present:15992kB managed:15908kB mlocked:0kB
dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB
slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB
unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB
pages_scanned:0 all_unreclaimable? yes<br>
[1246854.291858] lowmem_reserve[]: 0 2980 3948 3948<br>
[1246854.291861] Node 0 DMA32 free:54616kB min:50828kB low:63532kB
high:76240kB active_anon:1940432kB inactive_anon:1020924kB
active_<a class="moz-txt-link-freetext" href="file:248kB">file:248kB</a> inactive_<a class="moz-txt-link-freetext" href="file:260kB">file:260kB</a> unevictable:0kB
isolated(anon):0kB isolated(file):0kB present:3129280kB
managed:3054836kB mlocked:0kB dirty:0kB writeback:0kB mapped:760kB
shmem:14616kB slab_reclaimable:9660kB slab_unreclaimable:8244kB
kernel_stack:1456kB pagetables:10056kB unstable:0kB bounce:0kB
free_cma:0kB writeback_tmp:0kB pages_scanned:803
all_unreclaimable? yes<br>
[1246854.291865] lowmem_reserve[]: 0 0 967 967<br>
[1246854.291867] Node 0 Normal free:16468kB min:16488kB
low:20608kB high:24732kB active_anon:462708kB
inactive_anon:487828kB active_<a class="moz-txt-link-freetext" href="file:140kB">file:140kB</a> inactive_<a class="moz-txt-link-freetext" href="file:288kB">file:288kB</a>
unevictable:0kB isolated(anon):0kB isolated(file):0kB
present:1048576kB managed:990356kB mlocked:0kB dirty:0kB
writeback:4kB mapped:260kB shmem:2452kB slab_reclaimable:3576kB
slab_unreclaimable:6668kB kernel_stack:560kB pagetables:3088kB
unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB
pages_scanned:975 all_unreclaimable? yes<br>
[1246854.291872] lowmem_reserve[]: 0 0 0 0<br>
[1246854.291874] Node 0 DMA: 1*4kB (U) 0*8kB 0*16kB 2*32kB (U)
3*64kB (U) 0*128kB 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (R)
3*4096kB (EM) = 15876kB<br>
[1246854.291882] Node 0 DMA32: 1218*4kB (UEM) 848*8kB (UE)
621*16kB (UE) 314*32kB (UEM) 189*64kB (UEM) 49*128kB (UEM) 2*256kB
(E) 0*512kB 0*1024kB 0*2048kB 1*4096kB (R) = 54616kB<br>
[1246854.291891] Node 0 Normal: 3117*4kB (UE) 0*8kB 0*16kB 3*32kB
(R) 1*64kB (R) 2*128kB (R) 0*256kB 1*512kB (R) 1*1024kB (R)
1*2048kB (R) 0*4096kB = 16468kB<br>
[1246854.291900] Node 0 hugepages_total=0 hugepages_free=0
hugepages_surp=0 hugepages_size=2048kB<br>
[1246854.291902] 4533 total pagecache pages<br>
[1246854.291903] 0 pages in swap cache<br>
[1246854.291905] Swap cache stats: add 343501, delete 343501, find
7730690/7732743<br>
[1246854.291906] Free swap = 0kB<br>
[1246854.291907] Total swap = 0kB<br>
[1246854.291908] 1048462 pages RAM<br>
[1246854.291909] 0 pages HighMem/MovableOnly<br>
[1246854.291909] 14555 pages reserved<br>
[1246854.291910] 0 pages hwpoisoned<br>
<br>
Regards,<br>
--<br>
Y.<br>
<br>
<br>
<br>
Le 02/08/2016 à 17:00, Yannick Perret a écrit :<br>
</div>
<blockquote
cite="mid:654351cf-d708-fde0-4394-d13fbeb83b2a@liris.cnrs.fr"
type="cite">
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<div class="moz-cite-prefix">So here are the dumps, gzip'ed.<br>
<br>
What I did:<br>
1. mounting the volume, removing all its content, umounting it<br>
2. mounting the volume<br>
3. performing a cp -Rp /usr/* /root/MNT<br>
4. performing a rm -rf /root/MNT/*<br>
5. taking a dump (glusterdump.p1.dump)<br>
6. re-doing 3, 4 and 5 (glusterdump.p2.dump)<br>
<br>
VSZ/RSS are respectively:<br>
- 381896 / 35688 just after mount<br>
- 644040 / 309240 after 1st cp -Rp<br>
- 644040 / 310128 after 1st rm -rf<br>
- 709576 / 310128 after 1st kill -USR1<br>
- 840648 / 421964 after 2nd cp -Rp<br>
- 840648 / 422224 after 2nd rm -rf<br>
<br>
I created a small script that performs these actions in an
infinite loop:<br>
while /bin/true<br>
do<br>
cp -Rp /usr/* /root/MNT/<br>
+ get VSZ/RSS of glusterfs process<br>
rm -rf /root/MNT/*<br>
+ get VSZ/RSS of glusterfs process<br>
done<br>
<br>
At this time here are the values so far:<br>
971720 533988<br>
1037256 645500<br>
1037256 645840<br>
1168328 757348<br>
1168328 757620<br>
1299400 869128<br>
1299400 869328<br>
1364936 980712<br>
1364936 980944<br>
1496008 1092384<br>
1496008 1092404<br>
1627080 1203796<br>
1627080 1203996<br>
1692616 1315572<br>
1692616 1315504<br>
1823688 1426812<br>
1823688 1427340<br>
1954760 1538716<br>
1954760 1538772<br>
2085832 1647676<br>
2085832 1647708<br>
2151368 1750392<br>
2151368 1750708<br>
2282440 1853864<br>
2282440 1853764<br>
2413512 1952668<br>
2413512 1952704<br>
2479048 2056500<br>
2479048 2056712<br>
<br>
So at this time glusterfs process takes not far from 2Gb of
resident memory, only performing exactly the same actions 'cp
-Rp /usr/* /root/MNT' + 'rm -rf /root/MNT/*'.<br>
<br>
Swap usage is starting to increase a little, and I don't saw any
memory dropping at this time.<br>
I can understand that kernel may not release the removed files
(after rm -rf) immediatly, but the fist 'rm' occured at ~12:00
today and it is ~17:00 here so I can't understand why so much
memory is used.<br>
I would expect the memory to grow during 'cp -Rp', then reduce
after 'rm', but it stays the same. Even if it stays the same I
would expect it to not grow more while cp-ing again.<br>
<br>
I let the cp/rm loop running to see what will happen. Feel free
to ask for other data if it may help.<br>
<br>
Please note that I'll be in hollidays at the end of this week
for 3 weeks so I will mostly not be able to perform tests during
this time (network connection is too bad where I go).<br>
<br>
Regards,<br>
--<br>
Y.<br>
<br>
Le 02/08/2016 à 05:11, Pranith Kumar Karampuri a écrit :<br>
</div>
<blockquote
cite="mid:CAOgeEnZebt2Hu9V_Ubii8hWW_snd93yNhFdPLC-QMDamZ8pEyQ@mail.gmail.com"
type="cite">
<div dir="ltr"><br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Aug 1, 2016 at 3:40 PM,
Yannick Perret <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:yannick.perret@liris.cnrs.fr"
target="_blank">yannick.perret@liris.cnrs.fr</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"><span class="">
<div>Le 29/07/2016 à 18:39, Pranith Kumar Karampuri
a écrit :<br>
</div>
</span>
<blockquote type="cite">
<div dir="ltr"><br>
<div class="gmail_extra"><br>
<div class="gmail_quote"><span class="">On Fri,
Jul 29, 2016 at 2:26 PM, Yannick Perret <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:yannick.perret@liris.cnrs.fr"
target="_blank">yannick.perret@liris.cnrs.fr</a>></span>
wrote:<br>
</span>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex"><span
class="">Ok, last try:<br>
after investigating more versions I found
that FUSE client leaks memory on all of
them.<br>
I tested:<br>
- 3.6.7 client on debian 7 32bit and on
debian 8 64bit (with 3.6.7 serveurs on
debian 8 64bit)<br>
- 3.6.9 client on debian 7 32bit and on
debian 8 64bit (with 3.6.7 serveurs on
debian 8 64bit)<br>
</span><span class=""> - 3.7.13 client on
debian 8 64bit (with 3.8.1 serveurs on
debian 8 64bit)<br>
- 3.8.1 client on debian 8 64bit (with
3.8.1 serveurs on debian 8 64bit)<br>
In all cases compiled from sources, appart
for 3.8.1 where .deb were used (due to a
configure runtime error).<br>
For 3.7 it was compiled with
--disable-tiering. I also tried to compile
with --disable-fusermount (no change).<br>
<br>
In all of these cases the memory (resident
& virtual) of glusterfs process on
client grows on each activity and never
reach a max (and never reduce).<br>
"Activity" for these tests is cp -Rp and
ls -lR.<br>
The client I let grows the most
overreached ~4Go RAM. On smaller machines
it ends by OOM killer killing glusterfs
process or glusterfs dying due to
allocation error.<br>
<br>
In 3.6 mem seems to grow continusly,
whereas in 3.8.1 it grows by "steps"
(430400 ko → 629144 (~1min) → 762324
(~1min) → 827860…).<br>
<br>
All tests performed on a single test
volume used only by my test client. Volume
in a basic x2 replica. The only parameters
I changed on this volume (without any
effect) are diagnostics.client-log-level
set to ERROR and network.inode-lru-limit
set to 1024.<br>
</span></blockquote>
<span class="">
<div><br>
</div>
<div>Could you attach statedumps of your
runs?<br>
The following link has steps to capture
this(<a moz-do-not-send="true"
href="https://gluster.readthedocs.io/en/latest/Troubleshooting/statedump/"
target="_blank">https://gluster.readthedocs.io/en/latest/Troubleshooting/statedump/</a>
). We basically need to see what are the
memory types that are increasing. If you
could help find the issue, we can send the
fixes for your workload. There is a 3.8.2
release in around 10 days I think. We can
probably target this issue for that?<br>
</div>
</span></div>
</div>
</div>
</blockquote>
<span class=""> Here are statedumps.<br>
Steps:<br>
1. mount -t glusterfs ldap1.my.domain:SHARE
/root/MNT/ (here VSZ and RSS are 381896 35828)<br>
2. take a dump with kill -USR1
<pid-of-glusterfs-process> (file
glusterdump.n1.dump.1470042769)<br>
3. perform a 'ls -lR /root/MNT | wc -l' (btw result
of wc -l is 518396 :)) and a 'cp -Rp /usr/*
/root/MNT/boo' (VSZ/RSS are 1301536/711992 at end of
these operations)<br>
4. take a dump with kill -USR1
<pid-of-glusterfs-process> (file
glusterdump.n2.dump.1470043929)<br>
5. do 'cp -Rp * /root/MNT/toto/', so on an other
directory (VSZ/RSS are 1432608/909968 at end of this
operation)<br>
6. take a dump with kill -USR1
<pid-of-glusterfs-process> (file
glusterdump.n3.dump.)<br>
</span></div>
</blockquote>
<div><br>
</div>
<div>Hey,<br>
</div>
<div> Thanks a lot for providing this information.
Looking at these steps, I don't see any problem for the
increase in memory. Both ls -lR and cp -Rp commands you
did in the step-3 will add new inodes in memory which
increase the memory. What happens is as long as the
kernel thinks these inodes need to be in memory gluster
keeps them in memory. Once kernel doesn't think the
inode is necessary, it sends 'inode-forgets'. At this
point the memory starts reducing. So it kind of depends
on the memory pressure kernel is under. But you said it
lead to OOM-killers on smaller machines which means
there could be some leaks. Could you modify the steps as
follows to check to confirm there are leaks? Please do
this test on those smaller machines which lead to
OOM-killers.<br>
</div>
<div><br>
<span class="">Steps:<br>
1. mount -t glusterfs ldap1.my.domain:SHARE /root/MNT/
(here VSZ and RSS are 381896 35828)<br>
2. perform a 'ls -lR /root/MNT | wc -l' (btw result of
wc -l is 518396 :)) and a 'cp -Rp /usr/*
/root/MNT/boo' (VSZ/RSS are 1301536/711992 at end of
these operations)<br>
3. do 'cp -Rp * /root/MNT/toto/', so on an other
directory (VSZ/RSS are 1432608/909968 at end of this
operation)<br>
</span></div>
<div><span class=""> 4. Delete all the files and
directories you created in steps 2, 3 above<br>
</span></div>
<div><span class="">5. Take statedump with kill -USR1
<pid-of-glusterfs-process><br>
</span></div>
<div><span class="">6. Repeat steps from 2-5<br>
<br>
</span></div>
<div><span class="">Attach these two statedumps. I think
the statedumps will be even more affective if the
mount does not have any data when you start the
experiment.<br>
</span></div>
<div><br>
</div>
<div>HTH<br>
<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"><span class=""> <br>
</span> Dump files are gzip'ed because they are very
large.<br>
Dump files are here (too big for email):<br>
<a moz-do-not-send="true"
href="http://wikisend.com/download/623430/glusterdump.n1.dump.1470042769.gz"
target="_blank">http://wikisend.com/download/623430/glusterdump.n1.dump.1470042769.gz</a><br>
<a moz-do-not-send="true"
href="http://wikisend.com/download/771220/glusterdump.n2.dump.1470043929.gz"
target="_blank">http://wikisend.com/download/771220/glusterdump.n2.dump.1470043929.gz</a><br>
<a moz-do-not-send="true"
href="http://wikisend.com/download/428752/glusterdump.n3.dump.1470045181.gz"
target="_blank">http://wikisend.com/download/428752/glusterdump.n3.dump.1470045181.gz</a><br>
(I keep the files if someone whats them in an other
format)<span class=""><br>
<br>
Client and servers are installed from .deb files
(glusterfs-client_3.8.1-1_amd64.deb and
glusterfs-common_3.8.1-1_amd64.deb on client side).<br>
They are all Debian 8 64bit. Servers are test
machines that serve only one volume to this sole
client. Volume is a simple x2 replica. I just
changed for test network.inode-lru-limit value to
1024. Mount point /root/MNT is only used for these
tests.<br>
<br>
--<br>
Y.<br>
<br>
<br>
</span></div>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
<div class="gmail_signature"
data-smartmail="gmail_signature">
<div dir="ltr">Pranith<br>
</div>
</div>
</div>
</div>
</blockquote>
<p><br>
</p>
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